Thermoelastic stability of nanocomposite sheets and shells considering the elasticity of the boundary bond

The urgent need to understand and optimize the behavior of advanced materials in harsh environments has motivated Associate Professor, Dr. Hoang Van Tung and his colleagues at Hanoi Architectural University to conduct the project "Thermal-elastic stability of nanocomposite panels and shells considering the elasticity of the boundary joints".

After a period of implementation, the project has achieved many outstanding results demonstrated through research content and scientific publications.

The main objective of this study is to extensively analyze the buckling and post-buckling behavior of variable mechanical properties carbon nanotube reinforced nanocomposite (FG-CNTRC) panels and shells subjected to thermal and thermo-mechanical loading, whether in monolayer or sandwich form. Special attention is also paid to the study of nonlinear stability of variable mechanical properties graphene-reinforced nanocomposite panels and shells under combined thermal and thermo-mechanical loading. In addition, it is essential to analyze the influence of the elasticity of the boundary connections on the buckling and post-buckling load-bearing capacity of the nanocomposite panel-shell structures. The entire study also aims to evaluate the interaction of important factors such as material distribution, loading conditions, shape imperfections, elastic foundations and temperature dependence of material properties, all of which directly affect the stability of the nanocomposite panel-shell.

The study analyzed important practical factors such as uneven heat transfer, elasticity of edge connections and temperature dependence of materials affecting the anti-rolling and post-rolling load-bearing capacity of thermally and thermo-mechanically loaded structures. In particular, the study showed that the elasticity of edge connections has a significant impact on the behavior and load-bearing capacity of the structure, especially for thermally loaded cylindrical panels.

In addition, the project has proposed a two-term deflection solution. This is a simple and effective analytical approach to study the linear stability of closed shells (cylindrical shells and relatively thick drum shells) based on the shear deformation theory. This type of solution can also be extended to the vibration analysis of similar shells.

The study also analyzed in detail the effects of material properties and geometry, carbon nanotube (CNT) distribution patterns, CNT volume fraction, elastic matrix, sandwich models, pores in homogeneous layers and structural shape imperfections on their ultimate load and load-bearing capacity. In addition, the study analyzed the effects of eccentric reinforcing ribs made from nanocomposite materials on the stability of FG-CNTRC and FG-GRC panels and shells. The results showed that the reasonable arrangement of ribs can significantly improve the anti-rolling performance for each type of load.

These research results have scientific significance and high practical applicability. Scientifically, the topic contributes to answering questions about the combined influence of edge displacement constraints, structural shape and imperfections on the behavior and load-carrying capacity of the structure. At the same time, it proposes a simple and effective analytical approach to solve the problem of stability and linear vibration of closed-shell structures. Practically, the research results provide valuable information and predict the thermoelastic stability of nanocomposite structures subjected to thermal and thermo-mechanical loads, thereby supporting the optimization of material and structural design, improving safety.

The full text of the research report (code 21079/2022) can be found at the Department of Information and Statistics.

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Source: https://skhcn.daklak.gov.vn/on-dinh-nhiet-dan-hoi-cua-tam-va-vo-nanocomposite-co-ke-den-tinh-dan-hoi-cua-lien-ket-bien-19842.html